AT90USB646 datasheet(430/435 Pages) ATMEL

430 / 435 page

7593D–AVR–07/06

AT90USB64/128

18.8Multi-processor Communication Mode ................................................................199

18.9USART Register Description ...............................................................................200

18.10Examples of Baud Rate Setting .........................................................................205

USART in SPI Mode ............................................................................. 208

19.1Overview ..............................................................................................................208

19.2Clock Generation .................................................................................................209

19.3SPI Data Modes and Timing ................................................................................209

19.4Frame Formats ....................................................................................................210

19.5Data Transfer .......................................................................................................212

19.6USART MSPIM Register Description ..................................................................214

19.7AVR USART MSPIM vs. AVR SPI ......................................................................216

2-wire Serial Interface .......................................................................... 218

20.1Features ..............................................................................................................218

20.22-wire Serial Interface Bus Definition ..................................................................218

20.3Data Transfer and Frame Format ........................................................................219

20.4Multi-master Bus Systems, Arbitration and Synchronization ...............................222

20.5Overview of the TWI Module ...............................................................................223

20.6TWI Register Description .....................................................................................226

20.7Using the TWI ......................................................................................................229

20.8Transmission Modes ...........................................................................................233

20.9Multi-master Systems and Arbitration ..................................................................246

USB controller ...................................................................................... 248

21.1Features ..............................................................................................................248

21.2Block Diagram .....................................................................................................248

21.3Typical Application Implementation .....................................................................249

21.4General Operating Modes ...................................................................................253

21.5Power modes .......................................................................................................257

21.6Speed Control ......................................................................................................258

21.7Memory management ..........................................................................................259

21.8PAD suspend .......................................................................................................260

21.9OTG timers customizing ......................................................................................261

21.10Plug-in detection ................................................................................................261

21.11ID detection .......................................................................................................262

21.12Registers description .........................................................................................263

21.13USB Software Operating modes .......................................................................267

AT90USB646 Datasheet(PDF) 430 Page - ATMEL Corporation